Literary usage of Swamp milkweed

Below you will find example usage of this term as found in modern and/or classical literature:

1.Minnesota Plant Life by Conway MacMillan (1899)"The swamp milkweed is similar in appearance, but has smaller clusters of flowers and
... It is to be looked for in swamps or F1G. 173. swamp milkweed. ..."

2.Specific Diagnosis and Specific Medication by John William Fyfe, John Milton Scudder (1909)"Asclepias Incarnata—swamp milkweed. swamp milkweed often promptly relieves the
general distress caused by extreme infiltration of the tissues in dropsy. ..."

6.A Source Book of Biological Nature-study by Elliot Rowland Downing (1919)"The swamp milkweed has the same general habit, but the leaves are lance-shaped
and the pods are slender and tapering. It usually grows in wet ground. ..."

8.Ginseng and Other Medicinal Plants: A Book of Valuable Information for by Arthur Robert Harding (1908)"Swamp-milkweed (Asclepias incarnata L.) is a native perennial herb found in swamps
from Canada to Tennessee and Kansas. The slender stem, leafy to the top, ..."